Micro-mesoporous MCM-41/ZSM-5 supported Pt and Pd catalysts for hydroisomerization of C-8 aromatic fraction

Architectural design of core–shell nanotube systems based on aluminosilicate clay

“…This may be extended by tuning halloysite acidity with etching, which helps to improve the acid-catalyzed C-S bond scission and C-C isomerization. 35,58 We conrmed retaining the nanotubular structure aer extrusion with a boehmite binder and for composites with silica followed by its calcination. 36 Halloysite is an aluminosilicate clay available in thousands of tons at a low price, and it may be used as a silica and alumina source for industrial zeolites with a desirable porous framework, textural properties, and acidity.…”

Novel Composite Catalysts Efficiently Catalyze C8 Aromatics by Controlling the Reaction Pathway

“…The dealkylation of EB in the C8 fraction to benzene is currently the most effective method. 3,6 The conversion of EB to benzene and ethylene during xylene isomerization can effectively prevent the accumulation of EB in the recycle loop. When xylene reaches thermodynamic equilibrium, it is optimal to obtain high EB conversion and low xylene loss at the same time.…”

“…When xylene reaches thermodynamic equilibrium, it is optimal to obtain high EB conversion and low xylene loss at the same time. 3,4,7 The isomerization process of C8 aromatics includes the isomerization of xylene and the dealkylation of EB. The isomerization of C8 aromatics is mainly an acid-catalyzed reaction.…”

“…3 Currently, industrial xylene isomerization catalysts are mainly prepared based on zeolite. 3,7,8 Zeolite has the advantages of high stability, high specific surface area, abundant pores, and acid sites density. 9−13 It is worth mentioning that the ZSM-5 zeolite has three-dimensional pores (5.1 Å × 5.5 Å and 5.3 Å × 5.6 Å) close to the dynamic diameter of PX, which are smaller than MX and OX.…”

“…In the petroleum industry, C8 aromatics are usually composed mainly of MX, OX, PX, and EB. , The boiling points of EB and PX are very close, resulting in significant energy consumption in the separation process of PX. The dealkylation of EB in the C8 fraction to benzene is currently the most effective method. , The conversion of EB to benzene and ethylene during xylene isomerization can effectively prevent the accumulation of EB in the recycle loop. When xylene reaches thermodynamic equilibrium, it is optimal to obtain high EB conversion and low xylene loss at the same time. ,, The isomerization process of C8 aromatics includes the isomerization of xylene and the dealkylation of EB.…”